archive: SETI FW: [ASTRO] Re: Distant Spacecraft Seem To Be Showing No Respect For The Laws Of Physics

SETI FW: [ASTRO] Re: Distant Spacecraft Seem To Be Showing No Respect For The Laws Of Physics

Larry Klaes ( lklaes@zoomtel.com )
Wed, 16 Sep 1998 15:34:58 -0400

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From: Ron Baalke
Sent: Wednesday, September 16, 1998 1:52 PM
To: astro@lists.mindspring.com
Subject: [ASTRO] Re: Distant Spacecraft Seem To Be Showing No Respect For The Laws Of Physics

>From John Anderson's paper, the following possible causes have been
ruled out with varying degrees of confidence:

o Solar radiation pressure is too small.
o Possible anisotropy in the thermal radiation from the RTG does not
fit with constantcy of deceleration anomaly.
o Radio beam effect would have opposite effect. ie. it points towards
Earth, and is too small.
o Gravity from the Kuiper belt.
o Gravity from the Galaxy
o Spacecraft gas leaks
o Errors in the planetary ephemeris
o Errors in the Earth's orientation, precession and nutation
o Precessional attitude control manouevers.
o Some aspects of the orbit modelling software.
o Hardware problems at the tracking stations.
o Milgrom's proposal that gravity has the form g = k/r^2 for
relatively small r and g = k'/r for large r.
o An added Yukawa force would give a radial term in the anomalous
behaviour, not observed.
o A spherically-symetric distribution of dark matter. If the density
of dark matter is high enough to affect Pioneer 10/11 & Ulysses then it
would affect the trajectory of planets.

One unresolved possibility is that there is a drift in the accuracy of
the atomic clocks used for analysis of range data.

Ron Baalke